1001 Freelance Projects
Latest Projects from
Freelance Marketplaces
View Project
View this project in detail
(Note: you will be redirected to external marketplace)
Project title:
Blockchain Full stack developer
Posted by:
External project from PeoplePerHour
Started:
25-Dec-2025 17:06 GMT
Description:
## Tech Stack
- **Blockchain**: Solidity, Polygon (MATIC), Ethereum
- **Development**: Thirdweb SDK, OpenZeppelin contracts
- **Tools**: Hardhat/Truffle, Remix IDE, MetaMask
- **Testing**: Chai, Mocha, Waffle
- **Deployment**: Thirdweb Deploy, Polygon Mumbai/Mainnet

## Key Responsibilities
- Develop and audit Solidity smart contracts for lottery mechanics
- Implement secure random number generation for winner selection
- Build gas-optimized functions for ticket purchasing and prize distribution
- Create admin functions for lottery operators (draw, refund, commission withdrawal)
- Integrate OpenZeppelin security standards and access controls
- Deploy and verify contracts on Polygon network
- Collaborate with frontend team on Web3 integration

## Smart Contract Features You'll Build
- **Ticket Management**: Purchase validation, quantity limits, price calculations
- **Random Winner Selection**: Secure randomness using block hash and timestamp
- **Prize Distribution**: Automated winnings calculation and withdrawal system
- **Commission System**: Operator fee collection and withdrawal mechanisms
- **Refund Logic**: Automatic refunds for expired draws
- **Access Control**: Role-based permissions for operators and users
- **Event Logging**: Comprehensive event emission for frontend integration

## Required Experience
- **4+ years** Solidity development experience
- **3+ years** smart contract deployment on mainnet
- **Expert knowledge** of Ethereum/Polygon networks and gas optimization
- **Production experience** with OpenZeppelin contracts and security patterns
- **Strong understanding** of DeFi protocols and tokenomics
- Experience with Thirdweb or similar Web3 development frameworks
- Knowledge of smart contract testing and auditing practices

## Technical Requirements
- Write secure, gas-efficient Solidity code following best practices
- Implement proper access controls and security modifiers
- Handle edge cases and error conditions gracefully
- Optimize contract size and gas consumption
- Write comprehensive unit and integration tests
- Document contract functions and deployment procedures
- Conduct security reviews and vulnerability assessments
Project ID:
3463066
Project category:
Project budget:
View this project in detail
(Note: you will be redirected to external marketplace)
Last Projects / Browse Projects
  Project Started
Experienced Animator for Audio App Level Icons
Category: 3D Animation, After Effects, Animation, Graphic Design, Motion Graphics
Budget: €25 - €50 EUR
02 Apr 2026 04:43 GMT
Interactive Electronics Schematic Design
Category: Circuit Design, Component Engineering, Electrical Engineering, Electronics, Embedded Systems, PCB Design And Layout, PCB Layout, Signal Processing
Budget: $15 - $25 USD
02 Apr 2026 03:54 GMT
Automated HubSpot Invoice System
Category: API Integration, CRM, Data Integration, Email Marketing, HTML, MySQL, PHP, Software Architecture
Budget: $250 - $750 AUD
02 Apr 2026 03:53 GMT
Teen Respect Article with Stories
Category: Article Writing, Book Writing, Content Writing, Copywriting, Editing, Fiction, Ghostwriting
Budget: ₹750 - ₹1250 INR
02 Apr 2026 03:52 GMT
NDIS Business Brand Identity Design
Category: Arts & Crafts, Branding, Creative Design, Graphic Design, Illustration, Logo Design
Budget: $30 - $250 AUD
02 Apr 2026 03:49 GMT
Engaging Educational Cartoon for Grade 1
Category: 2D Animation, AI Animation, AI Content Creation, Animation, Caricature & Cartoons, Fiction, Screenwriting, Script Writing, Video Production, Voice Over
Budget: $30 - $250 USD
02 Apr 2026 03:49 GMT
Modern Sleek Used Car Sales Website
Category: CSS, Graphic Design, HTML, PHP, User Experience Research, Web Design, Web Development
Budget: $250 - $750 USD
02 Apr 2026 03:49 GMT
Modern Minimalist Letterhead Design
Category: Adobe Illustrator, Photoshop, Branding, Graphic Design, Illustration, Logo Design, Print Design
Budget: $10 - $30 CAD
02 Apr 2026 03:49 GMT
230-Page Fiction Proofreading
Category: Copy Typing, Microsoft Access, Photo Editing
Budget: ₹750 - ₹1250 INR
02 Apr 2026 03:48 GMT
Natural Reels & TikTok Editing
Category: Color Grading, Video Editing, Video Post Editing, Video Processing, Video Services
Budget: $30 - $250 USD
02 Apr 2026 03:48 GMT
Modern Hardie Board Exterior Design
Category: 3D Rendering, 3D Visualization, AutoCAD, Building Architecture, Building Design, Design Optimization, Exterior Design, Interior Design
Budget: $30 - $250 USD
02 Apr 2026 03:47 GMT
Academic Paraphrasing Specialist Needed
Category: Academic Writing, Article Rewriting, Content Writing, Copy Editing, Editing, Proofreading, Report Writing, Research Writing, Technical Writing, Writing Tutoring
Budget: $10 - $30 USD
02 Apr 2026 03:47 GMT
Residential Site & Permit Plans
Category: 2D Drafting, Architectural Engineering, AutoCAD, Building Architecture, Building Design, Construction Management, PHP, Web Design
Budget: $30 - $250 USD
02 Apr 2026 03:45 GMT
Bots making project
Category: Android, API, Automation, Bot Development, IPhone, Mobile App Development, PHP, Web Development
Budget: ₹37500 - ₹75000 INR
02 Apr 2026 03:43 GMT
Recover Lost Mobile App Access
Category: Database Management, Database Programming, Flutter, IOS Development, IPad, IPhone, Mobile App Development, MongoDB
Budget: ₹601 - ₹1000 INR
02 Apr 2026 03:43 GMT
Browse All Projects
Projects by Skills ...
android
ajax
asp
aspnet
cms
cpp
csharp
css
delphi
design
drupal
excel
facebook
flash
html
java
javascript
joomla
iphone
mysql
photoshop
php
python
ruby
seo
sql
sysadm
translate
typing
twitter
vbnet
xml
wordpress
writing
New!
Проекты на русском
(Projects in Russian)

Copyright © 2005-2025
1001 Freelance Projects